I am also winx dvd ripper platinum user, and I contact the support team for you. The following the I quate from them support email, hope this can help you.
"Could you please do as following to have a try?
1. Could you please use “Force A/V sync” in the advanced setting to have a try?
If your original audio is out of sync with movie, the Intelligent A/V Synchronizer can help you solve the problem
2. If your DVD is NTSC, please change the “Video Frame Rate” to 29.97, if it is PAL, please change the “Video Frame Rate” to 25
3. Could you please tell us the DVD's name?
And could you please use 'Copy' function to have a try? ('Copy' function enables you to backup your DVD with original video, audio)
4. Besides, could you please send us the screen shots about the problem? (Show all the parameters)
PS, Please download the latest versionï¼
Download link: http://www.winxdvd.com/download/winx-dvd-ripper-pt.exe
Could you please use following program to sync audio for AVI to have a try?
http://www.free-codecs.com/download/YAAI_Yet_Another_Avi_Info.htm
Yet Another Avi Info is one of the best tools to display information about your avi files. You can see data like the framerate, the used codecs, the running time, the author information and the exact bitrate of video and audio. You can also synchronize your video and audio stream in a very comfortable way."
If you still donfused, you can email them yourself. I get the answer only in 5 muniutes after I send my email.
support@winxdvd.com